Medium 6.4Published Nov 7, 2007

CVE-2007-1661Perl-Compatible Regular Expression (PCRE) library before 7.3 backtracks too far when matching certain input bytes against some regex patterns in non-UTF-8 mode, which allows context-dependent attacke…

Updated under an hour ago (Nov 2, 2026, 12:20 AM ET)

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It affects pcre perl-compatible_regular_expression_library and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Perl-Compatible Regular Expression (PCRE) library before 7.3 backtracks too far when matching certain input bytes against some regex patterns in non-UTF-8 mode, which allows context-dependent attackers to obtain sensitive information or cause a denial of service (crash), as demonstrated by the "\X?\d" and "\P{L}?\d" patterns.

CVSS: 6.4 MEDIUM (v2.0, NVD)AV:N/AC:L/Au:N/C:P/I:N/A:P
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

pcre perl-compatible_regular_expression_library pcre:perl-compatible_regular_expression_library	through 7.2; 7.0; 7.1	NVD
apple mac_os_x apple:mac_os_x	10.4.11	NVD
apple mac_os_x_server apple:mac_os_x_server	10.4.11	NVD

References

References

http://bugs.gentoo.org/show_bug.cgi?id=198976
http://docs.info.apple.com/article.html?artnum=307179
http://docs.info.apple.com/article.html?artnum=307562
http://lists.apple.com/archives/security-announce/2007/Dec/msg00002.html
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html
http://mail.gnome.org/archives/gtk-devel-list/2007-November/msg00022.html
http://secunia.com/advisories/27538	vendor-advisory
http://secunia.com/advisories/27543	vendor-advisory
http://secunia.com/advisories/27554	vendor-advisory
http://secunia.com/advisories/27697	vendor-advisory
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The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.